Abrasive-wheel chuck for grinding machines



July 10, 1923. HAMAS@ F. E. GARDNER ARAsIva-WHEEL CHUCK Fon Gnmpme MACHINES Fiea June 14. 1920 Patented July 10, 1923.

PATENT orifice.

FREDERIC E. GARDNER, OF BELOIT, WISCONSIN.

ABRASIVE-WHEEL CHUCK FOR GRINDING MACHINES.

Application ledlune 14, 1920. Serial No. 388,772.

To all whom t moy concern;

lBe it known that I, Fnrnrrrc E. Garonne,

e citizen ofthe United States, residing et Beloit, in the county of Rook and State oi Wisconsin, h-ave invented certain new and useful improvements in Abrasive-Wheel Chucks for Grinding Machines, of which the, izfzllowing .speoiii-oston.

The invention relates to grinding Inechinos end .rnore `parthallar-ily to o ohuek for holding revolving yabrasive 4wheels oi the .ringiyre 1 The prinope-l object of my invention is to provide ebuoir havin-g impr-ered menus foro leinping the abrasive wlieelin operating position.

Ano-ther .object is to V,provide -a chuck wbiohis adjustable vto varying sizes oi .abresive wheelsend whiolrpermitsof uniek and easy renewal of wenn wheels.

.A further object vis :to `Provide a simple, durnbly constructed ehuoln of which the olernnng device .be .readily cleaned to prevent the clogging, off parte with grit- Further objects and advantages will appeer in the 4following description o f the .preferred embodimentof `rnv inventionln the Aae.eononarising drawings, Figure l represents el-pien view efe chuck and ring wheel, one side being Partially out away .on -a plane indicated by the Vline Ilf-l 'in Fig. 2. Fig. 2 is a sectional side viewtalren in the line 2*- 2 Figi. Fig- Vis a sido elevation of Ithe chuck and ring wheel. l represents the shell .of the chuck. ig. v5 presents a clamping shoe V1n plan and v side view.

Generally ,stated9 the device composed cfa shell comprising aback plate l and an interrupted Acylimlrieal rino upon which is mounted a concentric retaining ring 3, fixed Vto the :rim and supporting Clamping shoes .e adapted .to engage and secure an abrasive ring wheel 5.

Referring `to .Figl, the oiroularr-baek Pietel forins Vthe .base :ozf the :device `is adapted to vbe attached bv any suitable means to thespndle of grinding machine. As illustrated :this instance, a bore w6 Vis @shown at :the center lof the back plate, dej;si;gned tobe centered :on a grinding machine spindle 'lhecyli-ndricalgrim y2 isintegrally fiorrned on zt-be .liront of :the back plate 1,

position.

concentric with the spindle bore 6. Spaced cylindrical segments 2a are ormed on the ,rim 2, and extend outwardly parallel to and concentric with the of the back plate. An annular retaining ring 8 is mounted upon the 4outer surface of the rim 2 and segments T,and ,is preferably rigidly attached thereto by rivetng Athe ring to the segments, asindicated at 7 A clamping shoe 4 is mounted in each space between the segments 2a. This shoe is in the form ofa stiff leaf springadapted vto be-orced into contact with the periphery of the abrasive ring 5 and to secure i-t in As seen in Figs. l and 2, the kshoes 4 are shaped to `fit freely within 'the segmental spaces formed between the segments 2a and are of somewhat less thickness than the adjoining segments. The `shoe is formed with the ,radius of curvature of its surfaces substantially less than the radius or the rim and segments. A screw 8 is mounted in the retaining vring 3 centrally of each of the segment-al spaces These screws are preferably ysunk Hush with the periphery of 'the retaining .ring to avoid the obvious danger attending outstanding screw beads on a revolving chuck. Each screw terminates in a stud r9 which engages ina hole l0 located centrally of the shoe and holds the shoe in position. A shoulder ll formed on each screw at the base of the ystud 9 abuts the outersurface of the shoes 4. i With the abrasive ring 5 positioned within the segments 2a and abutting the back plate l, the screws 8 may be driven against the shoes l, forcing 'them into binding contact with the ring and holding the latter rigidly in its proper position. The spring Vshoes `coact with the shoulders on the screws grit :which .otherwise would clog the clamp- -i-ng device and interfere with the ready .re-

moval and renewalof the :ring wheels, and

Vhile I have herein shown and described4 with considerable particularitythe preferred embodiment of my invention, I do not intend to be limited in the interpretation of the appended claims to the details of construction set forth, except as may be necessitated by the prior ait.

I claim as iny invention:

l. A device of the character described comprising, in combination, a shell having a back plate and a rim comprising spaced cylindrical segments, a ring mounted upon said shell and enclosing said rim, and a plurality of independent clamping elements supported on said ring between said segments.

Q. A device of the character described comprising, in combination, a shell having a back plate and a cylindrical rim, a plurality oi' spaced cylindrical segments formed on said rim, a ring mounted on said rim overlying said segments, and a plurality of separable clamping elements supported on said ring and adapted to be moved radially between said segments.

3. A device of the character described comprising, in combination, a shell, an annular ring attached to' said shell, a plurality of removable clamping means mounted 'on said ring, means Jfor maintaining said clamping means in position, and means for moving said clamping means in a radial direction to engage and secure a grinding` Wheel.

4. A chuck comprising, in combination, a shell having a web portion forming a bac-k plate and a rim portion forming a series of spaced cylindrical segments, a ring mounted on said shell having iixed engagement with said'rim portion, a plurality of separable clainping shoes positioned between said segments, and means for actuating said shoes mounted o-n said ring.

5. A chuck comprising, in combination, `a back plate, a'rim formed on said back plate, a ring mounted on said rim, and a plurality of clamping shoes associated with said ring, said clamping shoes being actuated by screw means supported in said ring, and operable to torce said shoes inwardly to engage and support the grinding ring.

6. A chuck comprising, in combination, a back plate, an annular rim formed on said back plate, a series oi spaced cylindrical segments formed on said rim concentrically therewith, a ring mounted on said rim, a plurality ot' screws mounted in said ring extending radially therethrough between said segments, and a plurality of separable clamping shoes supported on and actuated by said screws.

7. A chuck comprising, in combination, a shell, an annular member mounted thereon,

a plurality of clamping Vshoes supported on said member, said shoes comprising curved leatsprings formed with a. radius of curvature substantially less than the radius of said annular member, and having apertures substantially at their apex of curvature, and means engaging said apertures for flexing said slices to increase their radius of curvature.

8. A chuck of the class described having, in combination, a shell comprising a back plate and an annular rim having a plurality of spaced segments extending parallel to the axis of said rim, a ring mounted on said shell concentric with said rim, clamp actuating means carried by said ring, and a plurality of clamping shoes supported by said actuating means, said shoes comprising leaf springs adapted to'be compressed by said actuating means. y i 9. In a chuck of the class described having an annular member adapted to support clamping means, a pluralityof clamping devices carried on said annular member coin-` prising actuating screws mounted in said member and removable spring clamping shoes supported on said screws, said spring shoes being adapted to lock said screws in set position.

10. A clamping shoe tor chucks having an annular supporting member with segments spaced apart so as to receive the shoes, said shoes being adapted to tit freely between said segment-s and being curved on a radius shorter than that of the annular supporting member. v

l1. In a chuck having an annular supporting member, a clamping shoe supported thereon and being curved on a radius substantially less than the radius of said supporting member, a screw mounted in said member, and a stud formed on the end of said screw and having a shoulder formed at its base, said shoe having an aperture therellU plurality of clamping shoes positioned Withmeans for applying an inwardly directed 1n said ring, said shoes having apertures force to said shoe, and means for positiontherein for engagement by said studs. ing and maintaining said shoe centrally of 10 13. In a chuck having a supporting ring, said first mentioned means. .'S a radially moving Clamping vShoe supported In testimony WheleO, I have heleuntO Set thereon and being curved on a radius submy hand. stantially less than the radius of said ring, FREDERIC E. GARDNER. 

